Dodge Repair Questions? Ask a Mechanic for Answers ASAP
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since it has overheated it may be possible that you have a damaged head gasket leaking combustion gases into the cooling system. this can be checked with a chemical kit that you can get at a parts store. the other possibility is a clogged radiator. if it has had sealants added, they clog up the cores and limit circulation.
you may have actually found the issue with a bad thermostat but it sounds more like you may have a bad head gasket.